Heat and Internal Energy
Physics ⇒ Heat and Thermodynamics
Heat and Internal Energy starts at 7 and continues till grade 12.
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See sample questions for grade 9
A 0.2 kg piece of metal at 80°C is placed in 0.5 kg of water at 20°C. The final temperature is 22°C. If the specific heat capacity of water is 4200 J/kg°C, calculate the heat gained by the water.
A 0.5 kg block of iron is heated from 20°C to 50°C. If the specific heat capacity of iron is 450 J/kg°C, how much heat is absorbed?
A 1 kg block of a substance at 25°C absorbs 4200 J of heat and its temperature rises to 35°C. What is its specific heat capacity?
A 200 g sample of a substance requires 800 J of heat to raise its temperature by 10°C. What is its specific heat capacity?
A 250 g sample of a metal at 100°C is placed in 100 g of water at 20°C. If the final temperature is 25°C, and the specific heat capacity of water is 4200 J/kg°C, calculate the heat lost by the metal.
A metal rod is heated at one end. Which method of heat transfer is primarily responsible for the other end becoming hot?
Define internal energy.
Describe how heat is transferred from the Sun to the Earth.
Describe the difference between heat and temperature.
Describe what happens to the internal energy of ice as it melts at 0°C.
Explain why a swimming pool at 25°C contains more heat than a cup of tea at 90°C.
Explain why metals feel colder than wood at the same temperature.
Explain why the temperature of boiling water does not rise even if it is heated further.
Explain why wearing white clothes in summer keeps you cooler than wearing black clothes.
If 500 J of heat is supplied to 2 kg of water, and the temperature rises by 0.06°C, what is the specific heat capacity of water?
State the law of conservation of energy as it applies to heat.
What is the formula for calculating the amount of heat (Q) absorbed or released by a substance?
What is the SI unit of heat?
